code: def change_coordinates_system_test_data(self):
      data = [
          dict(
              from_coordinates_system="half-space",
              to_coordinates_system="ball",
              point=gs.array([0.0, 1.0]),
              expected=gs.zeros(2),
          ),
          dict(
              from_coordinates_system="half-space",
              to_coordinates_system="ball",
              point=gs.array([[0.0, 1.0], [0.0, 2.0]]),
              expected=gs.array([[0.0, 0.0], [0.0, 1.0 / 3.0]]),
          ),
      ]
      return self.generate_tests(data)
  
file_path: geomstats/tests/tests_geomstats/test_geometry/data/hyperbolic.py
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .riemannian_metric import RiemannianMetricCmpWithTransformTestData, RiemannianMetricTestData
label_desc: Use image node_id 1 for calling the HyperbolicCoordsTransform2TestData obj's underlying member method code with example usage: obj.change_coordinates_system_test_data() and returns: self